Tractor-wheel.



1- A. -GALVIN.

RAcToR WHEEL.

I 4. ma. Patented Aug; 20, w18.

2 s'fiEU l' TWA lll

{IlIlIlallm L A. GALVIN.

TRACTOR WHEEL.

.u APPLICATION FILED HAR 14T HHB. y f l 92 a 9@ l 5 T Patente Aug. 20, i918,

2 SHEETS-SHEET 2.

INVENTOR ATTORNEY entras artnr ernten.

.THN A. GALVIN, F SPALDING, NEBRASKA.

Taecrosfyvnnar..

Specication of Letters latent.

Patenten aug. so, rais.

' Application mediteren 14; 191e. senalnezaaiie'.

To all whom t may concern duce improved means for keeping the wheels lwheel unit, and

'ree ot' mud, stone, and other obstructions which accumulate upon them, andwhich must new beremoved by hand to prevent the tractor wheel from slipping. Another objectis to build up a composite tractor wheel ot' a number of units or elements which are detachable and replaceable when they become broken or injured, which makes the wheel lighter as a whole, which gives a better grip on the surface than a .narrower wheel would ail'ord, and which provides channels into which may enter disks for cutting and cleaning oil' the accumulation. Details will be set forth below, and reference is made to the drawings, whereinz Figure l is a plan View of this tractor wheel in one of its forms, and of the mechanism t'or driving it, L

Fig. 2 is a side elevation ot the'same,

Fig. 3 is a longitudinal section through a part of said wheel,

Fig. Ll is a detail of what l call the whole Fig. 5 a detail of what call a segmental unit.

Fig. G is a perspective detail of one seg-Y mental unit.

ln frame bars l is mounted a shaft 2 carrying the several units hereinafter described, and also, as shown in Figs. l and 2 carrying a driven gear 3 meshing with a driving or power gear 4, which latter may be driven by any suitable motor on the frame, not shown and not. necessary to describe in this specification. The power thus communicated to the main shaft is intended to drive the machine over the ground by the grip of the tractor wheel with the surface thereof. This I ellect by building my wheel in an improved manner. seen in'Fig. -1 it is made up of tive elements or units, th first, third, vand fifth of which are whole wheel units 5 as seen in Fig. Ll, each preferably having a hub 6 mounted fast on the shaft 2, spokes '7 radiating from said hub, and a rim which is roughened on its outer periphery'so as to make good grip on the earth.v The tractor wheel as a whole also includes two segmental units 8`interposed between the whole wheel units as seen in Fig. 1. Each segmental unit is of the con- -tour best illustrated in Fig. 5. That is to say, at two opposite sides v9 it is curved on itsperiphery to follow vthe curvature of theperiphery ofthe whole wheel unit, and at its two remaining sides it is cut oli' on a chord 10, and on lines which are straight;v

or otherwise as. preferred. The composite tractor wheel furtheroincludes four Washers 1l interposed betweenthe other elements and having hubs 11 strung on the shaft and extending into cavities at the centers of the units 8 seen in Fig. 3. The washersare somewhat smaller in size than vthe shortest diameter of the segmental unitas indicated `by the dotted circle 11 in Fig. 5, and therefore the edge of the washer at no point comes even opposite the chord line 10. lVhile any suitable means may. be employed for fastening the several elements together into a composite whole, I preferably pass rods or bars 12 through holes 13 in the segmental units and iu the washers, and through elements 14 bolted or clipped to the spokes 7 of the Whole wheel units, asseen in Fig. 4. These bars in Fig. 3 are illustrated in the form of bolts, each having a nut 15 at one end andahead or another nut 16 at the other end, and if so they maybe tightened up to hold the parts thus assembled. Although I Fig. 1 as standing in strict parallelism with each other, it is obvious that they could be set Ion the shaft in dilerent positions. Also it is obvious that there might be a greater or lesser number of the several units than illustrated. lf a very wide tractor wheel Were desired, theremight be seven or even nine vand be attached to the spokes of all the which spokes I employ to ywhole wheel units, make these units lighter.

For cleaning the mud, dirt, and other accumulations from between the units, I mak@ have shown the `two segmental units 8 8 of lith- 

